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About Our Freeze Dryers

DNS Global Foods sells Freeze dryer for food, ready meals and nutritional products at economical price. We sell small freeze dryer with 10 Kg, 20 Kg capacity and medium freeze dryer with 50 Kg, 100 Kg capacity and large commercial Industrial freeze dryer with 200 Kg, 300 Kg and 400 Kg capacity.

Freeze dryers can be used for producing freeze dried instant meals, Freeze dried fruits like freeze Dried mango, freeze dried strawberry, freeze dried apple, freeze dried blueberries, freeze dried camel milk powder, freeze dried meals, freeze dried mushrooms, freeze dried yogurt bites, freeze dried pineapple, freeze dried fruits, freeze dried vegetables like freeze dried peas, freeze dried sweetcorn etc.

What is Freeze Drying ? What does Freeze Dryer do?

Climate change, population growth and global warming have been playing a spoilsport in fresh food supply and have resulted in huge imbalance of demand and supply of fresh food. Discussions around food and preservation have become center stage and preserving food has become the mainstay of any economy. Different forms of food drying are being carried out to preserve food. However, freeze drying remains the gold standard within food preservation mechanisms.

A Freeze Dryer, also known as a freeze drying machine, eliminates moisture from perishable products to preserve them, prolonging their shelf life and facilitating transportation. The Freeze Dry process involves freezing the material and subsequently lowering the pressure while introducing heat, causing the frozen water within the material to transform directly into vapor through sublimation.

Different Phases in Freeze Drying

Phase 1: Freezing or Ice Make Stage

  • In the initial stage, the product is subjected to freezing temperatures ranging from -20 to -30°C.

Phase 2: Primary Drying (Sublimation)

  • During the second phase, known as primary drying or sublimation, the material undergoes a reduction in pressure, accompanied by the application of heat, facilitating the sublimation of water from the material
  •  The vacuum of the freeze dryer accelerates the sublimation process, while its cold condenser serves as a surface for water vapor to adhere and solidify. Additionally, the condenser plays a crucial role in safeguarding the vacuum pump from the impact of water vapor.
  • About 95% of the water in the material is removed in this phase.
  • Primary drying can be a slow process. Too much heat can alter the structure of the material.

Phase 3: Secondary Drying (Adsorption)

  • In the last stage, known as secondary drying or adsorption, the water molecules that are ionically bound are eliminated. 
  • By raising the temperature higher than in the primary drying phase, the bonds are broken between the material and the water molecules.
  • Materials subjected to freeze-drying maintain a porous structure.
  • Once the freeze dryer finishes its cycle, the vacuum can be disrupted by introducing air into the chamber.
  • Most materials can be dried to 1-5% residual moisture.

Consumer friendly buying options to purchase a Freeze Dryer

Q & A

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